The brown skin on a hazelnut is very bitter. Remove the skin and it will add a much better flavor to your spread. 
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Credit: Oxmoor House

How to Skin Hazelnuts:

Toasting enhances the flavor of hazelnuts, making them smoky and crunchy. After toasting, it's important to remove the bitter brown skin for a better flavor.

1. Spread shelled hazelnuts in a single layer on a baking sheet. Bake at 350° for 15 minutes or until the skins begin to split, turning once.

2. Transfer the toasted hazelnuts to a colander or dish, and rub briskly with a towel to remove the skins.